I’ve had to make the hard decision as to what type of capacitors to use in a power supply I’ve been designing.  I need a 5.0v, 3.3v, 1.9v and 1.2v rails powered by a 12v adaptor.  The 5.0v and 3.3v rails use a DC/DC switching regulator while the 1.9v and 1.2v use a LDO regulator feed from the 3.3v rail.   Both require bypass/filtering capacitors and I’ve traditionally used 10uF 16V 20% Tantalums — for some reason the “Case B” end up being cheaper than the 2010 sized equivalent of the X7R MLCC (ceramic).

Tags: , , ,